采用非均相方法制备了3种不同取代度的羟丙基决明子多糖。决明子多糖经羟丙基改性后，改善了冷水可溶性，胶液透光率可达95%；取代度越大，黏度越大，对质量分数的依赖性越明显；羟丙基决明子能溶于甘油中，取代度越大，溶解性越好，增稠性越强。羟丙基决明子多糖与牙膏常用的黄原胶复配使用具有协效性，当添加质量分数为2%、复配质量比为1.2：0.8时协效性最显著，其黏度为2%黄原胶黏度的3.5倍、羟丙基决明子的10.6倍；复配体系具有较好的抗盐性、抗酸性，作为牙膏增稠剂使用优势显著。

Heterogeneous method is employed to prepare three kinds of hydroxypropyl cassia polysaccharides with different degrees substitution.The modified cassia polysaccharide has an improved cold water solubility and its glue transmittance is increased to as high as 95%.The greater the substitution degree,the greater the viscosity and the more obvious the dependence on the mass fraction.Hydroxypropyl cassia polysaccharides can be dissolved in glycerol,and the greater the substitution degree,the better the solubility and the stronger the thickening.It is synergistic for the compound of hydroxypropyl cassia polysaccharide with xanthan gum commonly used as toothpaste thickening agent.The synergy effect is the best when the total mass amount is 2%,and the compound mass ratio of hydroxypropyl cassia polysaccharide to xanthan gum is 1.2∶0.8.Under these compounding conditions,the viscosity of compound system is 3.5 times that of xanthan gum and 10.6 times that of hydroxypropyl cassia.The compound system shows better salt and acid resistance,exhibiting significant advantages when it is used as toothpaste thickeners.

徐玉枫(1995-),男,硕士研究生,研究方向为精细功能高分子材料,1653474767@qq.com